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SPECIFICATIONS
CONTROLS MAIN SECTION
Master Level: -12 to +12 dB
Low Shelf: 16 to 500 Hz High-pass filter
High Shelf: 1 to 30 kHz Low-pass filter
Active Switch: Activates/bypasses equalization circuitry
CONTROLS FREQUENCY SECTIONS
Frequency Controls: 70Hz to 1.5khz
150Hz to 3kHz
300Hz to 10kHz
600Hz to 20kHz
Width: .3 to 3 Octaves each band
Level: -15 to +15 dB each band
Frequency Response: 16 Hz to 30 kHz +/-3 dB
THD: <.03%
S/N Ratio: >90 dB
Max Input: +22 dB
Max Output: +22 dB
Input Impedance: 10KΩ (20K balanced)
Output Impedance: 50Ω
Shelving Slope: 12 dB / Octave
Size: 19" x 6" x 1.75"
(48.3 x 15.2 x 4.5 cm)
Weight: 5 lbs. (2 kg)
ARCHITECTURAL AND ENGINEERING SPECIFICATIONS
The active parametric equalizer shall be a single chan-
nel device that provides four independent bands of pro-
portional-Q type filtering. There shall also be separate
high-pass and low-pass shelving filters. The unit shall
have an internal power supply capable of operating from
120 to 240 VAC, 50/60Hz line. The voltage selection
shall be internally selectable via transformer primary
winding configuration. Front panel LEDs shall indicate
signal clipping, and power status.
The equalizer shall utilize four filter bands. Each band
shall have a +/-15 dB of boost or cut of the following
frequency ranges; 70 Hz to 1.5 kHz, 150 Hz to 3 kHz,
300 Hz to 10 kHz, and 600 Hz to 20 kHz. Each fre-
quency select control shall be accurate to within 10%
of the indicated setting. The width (Q) control for each
frequency range shall be continuously variable from .3
to 3 octaves. The high shelving filter shall have an at-
tenuation rate of 12 dB per octave and shall have a vari-
able frequency selection from 1 kHz to 30 kHz. The
low shelving filter shall have an attenuation rate of 12
dB per octave and have a variable selection from 16 Hz
to 500 Hz. The equalization circuitry shall be engaged
via a front panel switch.
The active parametric equalizer shall have a frequency
response +/- 3dB from 16Hz to 30 kHz (EQ bypassed).
The total harmonic distortion shall not exceed .03%.
The equalizer shall accept a maximum input level of
+22 dB, and shall allow a maximum output of +22dB.
A front panel clip LED shall indicate a signal reaching
3 dB below clipping. The inputs shall be unbalanced
RCA and 1/4", and a balanced XLR type with imped-
ances of 10K ohms and 20K ohms respectively. The
outputs shall be unbalanced RCA and 1/4", and bal-
anced XLR with impedances of 50 ohms.
The equalizer shall be 19" wide by 6" deep by 1.75"
high and shall weigh 5 pounds. It shall have a connected
power cable and shall be CE and CSA approved
The equalizer shall be the Rolls RPQ160 Parametric
Equalizer.